12 genera are assigned to the class MARRELOMORPHA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| ACERCOSTRACA | Vachonisia | D | Emsi-l | D | Emsi-l |
| CYCLINA | Apionicon | C | Mosc-u | C | Mosc-u |
| CYCLINA | Carcinaspides | Tr | Nori | Tr | Nori |
| CYCLINA | Cyclocarcinides | Tr | u | Tr | u |
| CYCLINA | Cyclus | C | Vise-l | P | l |
| CYCLINA | Halicyne | C | Mosc-u | Tr | Nori |
| CYCLINA | Hemitrochiscus | P | Guad | P | Guad |
| CYCLINA | Mesoprosopon | Tr | Nori | Tr | Nori |
| CYCLINA | Oonocarcinus | P | Leon-u | Tr | u |
| MIMETASTERIDA | Marrella | Cm | mMid-u | Cm | mMid-u |
| MIMETASTERIDA | Mimetaster | D | Emsi-l | D | Emsi-l |
| MIMETASTERIDA | Paramarria | O | Ashg-m | O | Ashg-m |
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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence
Stage abbreviations follow Sepkoski (2002).